Frequencies for first 10,000 rows of mager variable in natl2005 dataset :

   Mother's |
Single Year |
 of Age U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         13 |          3        0.03        0.03
         14 |          9        0.09        0.12
         15 |         32        0.32        0.44
         16 |         75        0.75        1.19
         17 |        171        1.71        2.90
         18 |        254        2.54        5.44
         19 |        458        4.58       10.02
         20 |        509        5.09       15.11
         21 |        560        5.60       20.71
         22 |        622        6.22       26.93
         23 |        627        6.27       33.20
         24 |        596        5.96       39.16
         25 |        565        5.65       44.81
         26 |        643        6.43       51.24
         27 |        548        5.48       56.72
         28 |        510        5.10       61.82
         29 |        517        5.17       66.99
         30 |        447        4.47       71.46
         31 |        437        4.37       75.83
         32 |        390        3.90       79.73
         33 |        345        3.45       83.18
         34 |        359        3.59       86.77
         35 |        312        3.12       89.89
         36 |        236        2.36       92.25
         37 |        183        1.83       94.08
         38 |        152        1.52       95.60
         39 |        128        1.28       96.88
         40 |        108        1.08       97.96
         41 |         82        0.82       98.78
         42 |         52        0.52       99.30
         43 |         32        0.32       99.62
         44 |         19        0.19       99.81
         45 |         13        0.13       99.94
         46 |          2        0.02       99.96
         47 |          1        0.01       99.97
         48 |          1        0.01       99.98
         49 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015